John klar



(No Model.) v J. KLAR.

HEAD FOR POLISHING STONE.

No.'416,462. Patented-Deo. v3, 1889.

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To all whom may concern/.-

UNITED STATES PATENT OFFICE.

JOHN KLAR, 0F iVESTFlELD, MASSACHUSETTS.

HEAD FOR POLISHING STONE.

SPECIFICATION forming part of Letters Patent No. 416,462, dated December 3, 1889.

Application filed January 5, 1889. Serial No. 295,497. (No model.)

Be it known that I, JOHN KLAR, of Westfield, in the county of Hampden and State of Massachusetts, have invented a new and useful Improvement in Heads vfor Polishing Stone, of which the following is a full, clear, and exact description.

My invention relates to a head for polishing stone, especially marble, and has for its object to provide a device capable of attachment to a polishing-machine, and to provide a polishing or grindinghead of simple and durable construction, and which will economize in grinding material.

The invention consists of the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to behad to the accompanying drawings, forming a part of this speciiication, in which similar figures of reference indicate corresponding parts in all the views.

Figure l is a plan view of the head. Fig. 2 is a horizontal section on line y q/ of Fig. 3. Fig. 3 is a transverse section on line 0c x of Fig. l. Fig. 4 is a bottom plan view, and Fig. 5 is a plan view of a sliglitly-inodified form of head.

In polishing marble or similar stone in order to secure good results' it is absolutely necessary to remove the sand pits developed by the iirst process of polishing-n amely,

roughly grin ding the surface. This is accom-A plished by rubbing the surface of the block to be polished with a sandstone or a stone of like formation.

Referring to the drawings by letter, the head is preferably constructed of a series of spaced concentric rings or bands 10, usually cast integral with the upper cross-bar 1l, which bar serves to properly space and also brace and strengthen the rings or bands. These rings or bands I0, and likewise the cross-bar 11, are preferably made of met-al, and are made either circular in contour, as illustrated in Fig. l, or of any other desired contour-for instance, essentially rectangular, -as illustrated in Fig. 5. Between the several contiguous rings or bands a block 12, of wood or like material, is secured, which blocks are preferably made of such thickness as that when placed in position the upper surface will be flush with the upper edge of the rings or bands, as shown in Fig. l, and the lower surface will be elevated a slight distance from the lower edge of said rings or bands, as best shown in Fig. 3.

Any number of the blocks l2 may be employed, and the said blocks may be located at any given point desired between the contiguous rings without departing from the spirit of the invention.

The space between the several rings is adapted to receive a plaster-of-paris filling 13, which filling also covers the lower or under surface of the several blocks l2, the lower surface of the said filling being smoothed off to provide a level under surface for the head. The upper portion of the head is preferably likewise leveled.

The space inclosed by the inner ring or band lO is not lled with plaster-of-paris, but is left entirely open for the admission of water to the surface of the stone to be ground when the head is in operation.

In practice I render the entire exposed surface impervious to water by imparting to said surface a coating of oil or other similar water-proof substance 17.

In completing the head, the grinding or polishing material employed is cemented or otherwise attached to the under face of the head, as illustrated in Fig. 3, and a space or aperture la is provided in the center of the polishing or grinding material, corresponding in contour and size to the inner surface of the inner ring or baud 10.

The cross-bar Il is provided at the center with spaced lugs or ears l5, between which ears or lugs a shaft 16 is pivoted to connect the polishing-head witha machine adapted to give motion thereto.

I desire it to be distinctly understood that the blocks 12 may be omitted without departing from the spirit of theinvention, as the said blocks are purposed only to facilitate the attachment of the plaster-of-paris, or other cement employed, to the frame of the head. As the said frame is not finished up after being cast, by which means it is preferably formed, 'the plasterbf-paris or cement will, under ordinary circumstances, readily adhere to the roughened surface of the said frame.

When the head is placed in contact with IOC the stone to be polished, the Water is fed in through the space encircled or inelosed bythe inner ring, from which it will he readily observed that the Water in finding an exit at the periphery of the head must of necessity constantly flow in Contact with the stone to he polished, and also in contact with the en lire under surface of the head.

It is very necessary that a. central aperture be provided for the head, not only to serve for introducingl water to the stone, but also to preserve an even surface upon the bottom of the head, since, if the under surface of the head were continuous, the rotary motion imparted thereto would cause the surface at and near the periphery to Wear much faster than the center; consequently in a short time the head would be as upon a pivot at the center, and the outer surface cease to contact with the stelle.

Having thus described niy invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A polishing-head consisting of a series of spaced bands or rings, a filling' of plasteroiparis introduced between the approaching surfaces of the several rings or bands, and a grinding or polishing1 material provided with a central aperture rigidly secured to the under surface ot the said rings and filling, suhstantially as shown and described.

2. The combination, with a series of concentric rings orbands, a series of blocks interposed between the rings or bands, and a filling of p1asteiot-paris introduced between the aliproaehing surfaces of the rings or bands, between the blocks and covering the lower fi'ace of the latter, of a grinding or polishing material provided with a central aperture rigidly secured to the under surface of the said rings and the filling, substantiallyas shown and described.

3. Ahead adapted for the reception of a grinding or polishing material, consisting of a series of spaced rings or bands, and a filling of plaste1'ot-pa1'is introduced between the approaching surfaces of the said rings or bands, flush with their under surfaces, the whole surface of the said plasteeof-pas being provided with a unter-proof coating, substantially as and for the purpose specified.

JOHN KLAR. lVitnesses:

W. Il. WHITNEY, A. E. WHEELER. 

